Just got a set of Pirelli Diablo Corsa III's fitted to loose wheels for £185 which seemed a good deal to me but then it gets better.

http://www.pirelli.co.uk/web/motorcycle/tyres/diablo_corsaIII_promo.page

I think the wsbk ticket is worth £35 and I was going anyway and therefore spending the money anyway so it makes the cost of the tyres £150 fitted which is a bloody bargain